Rewrite get_disc_link to handle special cases

Use methods of pywikibot site-object and mwparser to get rid of any
special elements like templates or links in headings for construction
of our disc link.
Replace   by hand as it otherwise will occur as normal space and
wont work

Related Task: [FS#147](https://fs.golderweb.de/index.php?do=details&task_id=147)

lib/redfam.py

@@ -611,22 +611,22 @@ class RedFamWorker( RedFam ):
         @rtype  str
         """
 
-        # We need to Replace Links with their linktext
+        # Expand templates using pwb site object
-        anchor_code = mwparser.parse( self.heading.strip() )
+        site = pywikibot.Site()
-        for link in anchor_code.ifilter_wikilinks():
+        anchor_code = site.expand_text(self.heading.strip())
-            if link.text:
-                text = link.text
-            else:
-                text = link.title
 
-            anchor_code.replace( link, text )
+        # Remove possibly embbeded files
+        anchor_code = re.sub( r"\[\[\w+:[^\|]+(?:\|.+){2,}\]\]", "",
+                              anchor_code )
 
-        # Whitespace is replaced with underscores
+        # Replace non-breaking-space by correct urlencoded value
-        anchor_code.replace( " ", "_" )
+        anchor_code = anchor_code.replace( " ", ".C2.A0" )
+
+        # Use mwparser to strip and normalize
+        anchor_code = mwparser.parse( anchor_code ).strip_code()
 
         # We try it without any more parsing as mw will do while parsing page
-        return ( self.redpage.pagetitle + "#" +
+        return ( self.redpage.pagetitle + "#" + anchor_code.strip() )
-                 str(anchor_code).strip() )
 
     def generate_disc_notice_template( self ):
         """